substituteOldMailAPI

Boolean: If this is set, old calls to t3lib_utility_mail::Mail() will be translated to new t3lib_mail calls. This should work on most cases and thus respect the above transport settings. If you get garbled emails (or no attachments), consider setting this off. Ask the extension author to upgrade their code to make use of t3lib_mail (instead of the deprecated t3lib_htmlmail).